In this tutorial it's described how you can set up a system so a special weapon is always in stage - and when it's thrown out or get destroyed it reappear...
This system modified all characters are modified so only normal heros (Davis, Woody...) are allowed in Stage Mode and also only in Single Player. Not allowed characters or Multiplayer will stop the stage. You can directly take this system for your version, but give credits!!!
With this new Stage Stop method you don’t have to activate the objects behind the bound-border anymore. Characters don’t fall to floor – they disappear in a new created frame.